Permutation padlock



Patented May 9, 1939 UNiTED STATES PATENT OFFICE 2 Claims.

This invention relates to keyless locks which may be opened only by setting the tumblers or latches thereof to a certain predetermined combination.

It is an object of the invention to provide a padlock of the character described which is composed of but few simple parts which lend themselves particularly well to production manufacture.

Another object of the invention is to provide a padlock of the class referred to which is very rugged and therefore is not likely to get out of order easily.

A further object of the invention is to provide 15 a padlock which is tamper-proof.

The invention possesses other objects and features of advantage, some of which, together with the foregoing, will be specifically set forth in the detailed description of the invention hereunto annexed. It is to be understood that the invention is not to be limited to the particular species shown and described as various other embodiments thereof may be employed within the scope of the appended claims.

Referring to the drawing:

Figure 1 is a vertical sectional view, partly in front elevation, showing the padlock of my invention in its closed position.

Figure 2 is a view similar to Figure 1 showing the padlock in its open position.

Figure 3 is a horizontal sectional view of the padlock. The plane in which the view is taken is indicated by the line 3-3 of Figure 1.

Figure 4 is a horizontal sectional view of the padlock. The plane of section is indicated by the line 4-4 of Figure 1.

Figure 5 is a front elevational view of the padlock. The View is taken looking at the rear of the structure of Figure 1.

In detail, the body of the padlock is composed of a plurality of superposed disks 6, 'l and 8, each of which is provided with a central aperture 9 and with ears l I each being bored to receive rivets 12 which extend entirely through the assembly 45 of disks to secure the latter together as a unit.

The central aperture 9 of each of the intermediate disks 1 is larger than those of the upper disk 6 and the lower disk 8. Each of the disks 1 and the upper disk 6 is provided, in the bottom face thereof, with a circular recess I3 in which is journaled a rotor 14 having an operating handle l6 which projects outwardly from the side of the lock body through a notch ll formed as an extension of the recess l3. Each of the rotors is pro- 55 vided with a central bore l8 of the same size as the apertures 9 of the top and bottom disks. The upper face of each of the disks 1 is provided with a recess 19 in which is seated a plate 2| having a central bore 22, equal in size to the bore I8 of the rotors, and a pair of ears 23 aperture to en- 3 gage the rivets 12. The lower disk 8 has in its upper face a recess 24 which is equal in size to, and in axial alinement with, the apertures 9 of the intermediate disks 1.

Mounted for slidable movement axially in the 10 central bore of the lock body formed by the alined apertures 9 of the top and bottom disks I8, of the rotors, and 22 of the plates 2!, is a bolt 26 extending from one side of which, at its upper end, is an ear 21 having an aperture 28 therein through which passes a pin 29 upon which is journaled the apertured clevis end 3| of the shackle 32. The side of the bolt diametrically opposite the ear 21 is provided with a lug 33 having a semi-circular groove 34 therein in which the distal end 36 of the shackle is adapted to seat when the lock is closed as shown in Figure 1. The bolt, at spaced positions intermediate its ends, is provided with a pair of pins 31 each of which is positioned at right angles to the other. 5

As was stated above, the bolt 26 is movable axially through the central bore of the lock body and to permit this the top disk 6 is provided with recesses 38 and 33 which receive, respectively, the hinge which connects the shackle and the bolt, and the distal end of the shackle which is nested in the groove 34. This allows both ends of the shackle to recede into the top disk when the lock is closed, as is shown in Figure 1, thus foiling any attempts which might be made to break the shackle from the bolt. Each of the plates 2| is provided with notches 4| through which the pins 31 may pass and the two lower rotors l4 each have therein complementary notches 42, which may be set at any angular relation with respect to the 40 handle IE to provide different combinations for opening the lock, and which may be moved into registry with the plate notches 4| to allow passage of the pins 31. The upper rotor is provided with a semi-circular notch 43 which, when 45 in registry with the free end 36 of the shackle, permits the latter to be moved into and out of the notch. When the upper rotor is rotated, with the shackle closed, as shown in Figure 1, the portion of the rotor bordering the notch 43 passes into a notch M provided at the free end of the shackle which locks the latter to the lock body. Similarly, when the bolt 23 is in its lowermost position so that the pins 31 are positioned below their associated rotors, rotation of the lat- 36 ter to move portions thereof bordering their respective notches to positions above the pins will prevent upward movement of the bolt. To provide for setting the hancue it connected with the rotors to the correct positions to aline their various notches with the locked elements so as to free the latter, the top and the two intermediate disks 6 and 1 are provided, at the edge of each notch IT, with marked indicia 46 with which pointers 41, stamped on each of the handles l6, are adapted to be registered.

The padlock of my invention described above possesses decided advantages over those now in general use for the reason that the sturdy construction and simplicity thereof renders it highly improbable that the lock will get out of order; for the reason that the feature of causing the hinge connection between the shackle and the bolt to recede into the lock body when the lock is closed renders the forcing open of the lock very difficult; for the reason that the design of the various parts render them incapable of rapid and economical mass production; and for the reason that the parts are capable of undergoing heat treatment or case hardening without danger of warping.

What is claimed is:

l. A padlock comprising a body having a bore therein, said body at one end of the bore having recesses therein extending radially from the bore, a bolt slidable axially in said bore having at one end thereof a head comprising radially extending lugs complemental to the recesses of said body, one of said lugs having therein a recess, a U- shaped shackle pivotally connected at one end thereof with one of said bolt lugs and having the other end thereof positioned to enter said lug recess, said bolt lugs, upon movement of said bolt axially in said bore, being movable entirely into and out of said body recesses, and means in said body for locking said bolt against movement axially in said bore.

2. A padlock comprising a body having a bore therein, said body at one end of the bore having recesses therein extending radially from the bore, a bolt slidable axially in said bore having at one end thereof a head comprising radially extending lugs complemental to the recesses of said body, one of said lugs having therein a recess, pins secured to and extending radially from said bolt intermediate the ends thereof, a U-shaped shackle pivotally connected at one end thereof with one of said bolt lugs and having the other end thereof positioned to enter said lug recess, said bolt lugs, upon movement of said bolt axially in said bore, being movable entirely into and out of said body recesses, and disks, rotatably which said pins may pass upon axial movement of said bolt in said body bore.

HARRY L. McINTURFF.

mounted in said body, having apertures therein through which 

